Troj_Dropper.EAA Trojan may be dropped by other malware. It may be downloaded unknowingly by a user when visiting malicious Web sites.

Upon execution, it creates registry entries to enable its automatic execution at every system startup. It also creates registry key(s)/entry(ies) as part of its installation routine.

It then executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system. It drops and executes certain files.

It deletes itself after execution.

Technical details can be found at this Trend Micro page.